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143 lines
5.5 KiB
143 lines
5.5 KiB
11 years ago
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/*
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* Copyright 2008-2012 NVIDIA Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <thrust/detail/config.h>
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#include <thrust/system/detail/generic/unique_by_key.h>
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#include <thrust/iterator/iterator_traits.h>
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#include <thrust/iterator/detail/minimum_system.h>
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#include <thrust/iterator/zip_iterator.h>
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#include <thrust/transform.h>
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#include <thrust/detail/temporary_array.h>
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#include <thrust/detail/internal_functional.h>
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#include <thrust/detail/copy_if.h>
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#include <thrust/unique.h>
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namespace thrust
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{
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namespace system
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{
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namespace detail
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{
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namespace generic
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{
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template<typename ExecutionPolicy,
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typename ForwardIterator1,
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typename ForwardIterator2>
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thrust::pair<ForwardIterator1,ForwardIterator2>
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unique_by_key(thrust::execution_policy<ExecutionPolicy> &exec,
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ForwardIterator1 keys_first,
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ForwardIterator1 keys_last,
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ForwardIterator2 values_first)
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{
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typedef typename thrust::iterator_traits<ForwardIterator1>::value_type KeyType;
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return thrust::unique_by_key(exec, keys_first, keys_last, values_first, thrust::equal_to<KeyType>());
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} // end unique_by_key()
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template<typename ExecutionPolicy,
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typename ForwardIterator1,
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typename ForwardIterator2,
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typename BinaryPredicate>
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thrust::pair<ForwardIterator1,ForwardIterator2>
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unique_by_key(thrust::execution_policy<ExecutionPolicy> &exec,
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ForwardIterator1 keys_first,
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ForwardIterator1 keys_last,
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ForwardIterator2 values_first,
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BinaryPredicate binary_pred)
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{
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typedef typename thrust::iterator_traits<ForwardIterator1>::value_type InputType1;
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typedef typename thrust::iterator_traits<ForwardIterator2>::value_type InputType2;
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ForwardIterator2 values_last = values_first + (keys_last - keys_first);
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thrust::detail::temporary_array<InputType1,ExecutionPolicy> keys(exec, keys_first, keys_last);
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thrust::detail::temporary_array<InputType2,ExecutionPolicy> vals(exec, values_first, values_last);
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return thrust::unique_by_key_copy(exec, keys.begin(), keys.end(), vals.begin(), keys_first, values_first, binary_pred);
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} // end unique_by_key()
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template<typename ExecutionPolicy,
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typename InputIterator1,
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typename InputIterator2,
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typename OutputIterator1,
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typename OutputIterator2>
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thrust::pair<OutputIterator1,OutputIterator2>
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unique_by_key_copy(thrust::execution_policy<ExecutionPolicy> &exec,
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InputIterator1 keys_first,
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InputIterator1 keys_last,
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InputIterator2 values_first,
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OutputIterator1 keys_output,
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OutputIterator2 values_output)
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{
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typedef typename thrust::iterator_traits<InputIterator1>::value_type KeyType;
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return thrust::unique_by_key_copy(exec, keys_first, keys_last, values_first, keys_output, values_output, thrust::equal_to<KeyType>());
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} // end unique_by_key_copy()
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template<typename ExecutionPolicy,
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typename InputIterator1,
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typename InputIterator2,
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typename OutputIterator1,
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typename OutputIterator2,
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typename BinaryPredicate>
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thrust::pair<OutputIterator1,OutputIterator2>
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unique_by_key_copy(thrust::execution_policy<ExecutionPolicy> &exec,
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InputIterator1 keys_first,
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InputIterator1 keys_last,
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InputIterator2 values_first,
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OutputIterator1 keys_output,
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OutputIterator2 values_output,
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BinaryPredicate binary_pred)
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{
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typedef typename thrust::iterator_traits<InputIterator1>::difference_type difference_type;
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// empty sequence
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if(keys_first == keys_last)
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return thrust::make_pair(keys_output, values_output);
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difference_type n = thrust::distance(keys_first, keys_last);
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thrust::detail::temporary_array<int,ExecutionPolicy> stencil(exec,n);
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// mark first element in each group
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stencil[0] = 1;
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thrust::transform(exec, keys_first, keys_last - 1, keys_first + 1, stencil.begin() + 1, thrust::detail::not2(binary_pred));
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thrust::zip_iterator< thrust::tuple<OutputIterator1, OutputIterator2> > result =
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thrust::copy_if(exec,
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thrust::make_zip_iterator(thrust::make_tuple(keys_first, values_first)),
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thrust::make_zip_iterator(thrust::make_tuple(keys_first, values_first)) + n,
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stencil.begin(),
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thrust::make_zip_iterator(thrust::make_tuple(keys_output, values_output)),
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thrust::identity<int>());
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difference_type output_size = result - thrust::make_zip_iterator(thrust::make_tuple(keys_output, values_output));
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return thrust::make_pair(keys_output + output_size, values_output + output_size);
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} // end unique_by_key_copy()
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} // end namespace generic
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} // end namespace detail
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} // end namespace system
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} // end namespace thrust
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